等离子体法制备碳化硅超细粉末研究

本文采用直流电弧等离子体法合成β－ＳｉＣ超细粉末，产品纯度大于９７％，平均粒径范围０．０５～０．５μｍ产率１ｋｇ／ｈ，此外，对其工业开发前景作了展望。     

铕在包头含稀土高炉渣中的富集规律

利用含稀土氧化物的合成炉渣进行了高炉生铁脱硫反应,对包头含稀土高炉渣中铕的分布及富集规律做了实验研究。     

固体氧化物燃料电池材料的发展前景

简要评述了固体氧化物燃料电池（SOFC）材料体系,以及研究开发这一材料体系需要注意的一些关键技术问题。我国丰富的稀土资源可用于开发固体氧化物燃料电池材料,同时具有较好的工业基础和研究实力,这类材料在我国将具有广阔的市场。     

氧化钛基光催化材料的离子掺杂和酸化改性

本文基于光催化反应的机理分析,采用了金属离子掺杂和表面酸化相结合的改性方法对TiO2颗粒做了优化处理.对改性后的样品利用XRD、FTIR和PL等测试技术对样品进行了表征并以亚甲基兰为模拟污染物进行了光催化降解实验.结果表明包覆在粉体表面的新相以金红石为主;Fe离子掺杂降低了光生电子和空穴的复合几率;表面酸化增加了TiO2表面以双齿桥方式配位的羟基,此种羟基对TiO2光催化活性有重要影响;铁离子掺杂和表面酸化协同的改性方法可以明显提高TiO2粉体的光催化活性.     

Interposition fixing structure of TiO2 film deposited on activated carbon fibers

1 Introduction Immobilization of TiO2 film on a substrate is necessary for its applications as TiO2 suspensions have fatal limitations in difficult separation and filtration for its reuse[1]. Thus, the fixing stability of TiO2 film with its substrate is …     

等离子体法制备碳化硅超细粉末研究

本文采用直流电弧等离子体法合成β－SiC超细粉末．产品纯度大于97％，平均粒径范围0．05～0．5μm，产率1km／h．此外，对其工业开发前景作了展望．     

Preparation and Characterization of Three-dimensional Photocatalyst-TiO2 Particulate Film Immobilized on Activated Carbon Fibers

A novel three-dimensional photocatalyst, TiO2 particulate film immobilized on activated carbon fibers (TiO2/ACFs), was prepared by liquid phase deposition. The photocatalyst was characterized by SEM, XRD, BET surface area and photodegradation of methylene blue solution. TiO2 particulate film, with a thickness of nearly 200 nm and grain sizes of 30~50 nm, was deposited on almost each carbon fiber. The inner space between adjacent fibers remained as unmodified ACFs, therefore, both UV illumination and polluted solutions were allowed to pass through the felt-form photocatalyst to form a three-dimensional environment for photocatalytic reactions. With BET surface areas of 400~600 m2/g, the TiO2/ACFs exhibited an enhanced adsorption of pollutants for photocatalysis. Comparative degradations indicated that photocatalytic activity of the TiO2/ACFs was slightly higher than that of Degussa P-25 TiO2. Two special properties, the three-dimensional structure and combined effects of ACFs' adsorption and titania's photodegradation, made contribution to high photocatalytic activity. Additionally, the TiO2/ACFs exhibited high stability and potentially application for practical usage.     

高吸附性负载型TiO2光催化材料的制备与结构性能表征

采用分子吸附沉积工艺制备了活性炭纤维基TiO2光催化材料,利用SEM、XRD、BET比表面及紫外可见吸收光谱(Uv-vis)表征了该材料的结构与形貌、TiO2的晶体结构、比表面积及紫外吸收性能.实验表明活性炭纤维丝上已大规模地负载了厚约100nm的TiO2颗粒膜,沉积的TiO2颗粒尺寸小于100nm,纤维丝间保留的空间可使紫外辐射进入光催化剂内部,形成一个具有三维结构的光催化空间;800℃以下焙烧处理,均可获得唯一的锐钛矿相TiO2;负载TiO2颗粒膜后,光催化剂的比表面积可达321.4m2·g-1,具有很强的吸附能力.试验考察了制备的光催化材料对亚甲基蓝的光催化降解过程,显示了较高的光催化活性,连续试验中展示了很好的稳定性.     

Photodegradation of Methylene Blue in a Batch Fixed Bed Photoreactor Using Activated Carbon Fibers Supported TiO2 Photocatalyst

A batch fixed bed photoreactor, using felt-form activated carbon fibers (ACF) supported TiO2 photocatalyst (TiO2/ACF), was developed to carry out photocatalytic degradation of methylene blue (MB) solution. The effects of TiO2 particle size, loaded TiO2 amount, initial MB concentration, airflow rate and successive run on the decomposition rate were investigated. The results showed that photodegradation process followed a pseudo-first-order reaction kinetic law. The apparent first-order reaction constant kapp was larger than 0.047 min-1 with half reaction time t1/2 shorter than 15 min, which was comparable to reported data using suspended Degussa P-25 TiO2 particles. The high degradation rate was mainly attributed to adsorption of MB molecules onto the surface of TiO2/ACF. The photocatalytic efficiency still remained nearly 90% after 12 successive runs, showing that successive usage of the designed photoreactor was possible. The synergic enhancement effect in combination of adsorption with ACF and photodegradation with TiO2 was proved by comparing MB removal rates in the successive degradation and adsorption runs, respectively.